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cc73685d | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
724e753c | 2 | |
d38dd64a CB |
3 | #ifndef _GNU_SOURCE |
4 | #define _GNU_SOURCE 1 | |
5 | #endif | |
cf685555 | 6 | #include <caps.h> |
724e753c | 7 | #include <errno.h> |
91480a0f | 8 | #include <fcntl.h> |
fe84a562 | 9 | #include <malloc.h> |
37515ebd | 10 | #include <poll.h> |
fe84a562 CB |
11 | #include <signal.h> |
12 | #include <stdio.h> | |
13 | #include <stdlib.h> | |
fe84a562 | 14 | #include <sys/param.h> |
724e753c MN |
15 | #include <sys/socket.h> |
16 | #include <sys/un.h> | |
d38dd64a | 17 | #include <unistd.h> |
724e753c | 18 | |
fe84a562 | 19 | #include "af_unix.h" |
f2363e38 | 20 | #include "cgroup.h" |
2a63b5cb | 21 | #include "cgroups/cgroup2_devices.h" |
724e753c | 22 | #include "commands.h" |
bbf5cf35 | 23 | #include "commands_utils.h" |
fe84a562 | 24 | #include "conf.h" |
d38dd64a | 25 | #include "config.h" |
ef6e34ee | 26 | #include "confile.h" |
fe84a562 CB |
27 | #include "log.h" |
28 | #include "lxc.h" | |
dbc9832d | 29 | #include "lxclock.h" |
cdb2a47f | 30 | #include "lxcseccomp.h" |
724e753c | 31 | #include "mainloop.h" |
5265a60c | 32 | #include "memory_utils.h" |
dbc9832d | 33 | #include "monitor.h" |
fe84a562 | 34 | #include "start.h" |
0ed9b1bc | 35 | #include "terminal.h" |
fe84a562 | 36 | #include "utils.h" |
724e753c | 37 | |
ded1d23f | 38 | /* |
fe84a562 CB |
39 | * This file provides the different functions for clients to query/command the |
40 | * server. The client is typically some lxc tool and the server is typically the | |
41 | * container (ie. lxc-start). | |
ded1d23f | 42 | * |
fe84a562 CB |
43 | * Each command is transactional, the clients send a request to the server and |
44 | * the server answers the request with a message giving the request's status | |
45 | * (zero or a negative errno value). Both the request and response may contain | |
46 | * additional data. | |
ded1d23f | 47 | * |
fe84a562 CB |
48 | * Each command is wrapped in a ancillary message in order to pass a credential |
49 | * making possible to the server to check if the client is allowed to ask for | |
50 | * this command or not. | |
80bcb053 | 51 | * |
fe84a562 CB |
52 | * IMPORTANTLY: Note that semantics for current commands are fixed. If you wish |
53 | * to make any changes to how, say, LXC_CMD_GET_CONFIG_ITEM works by adding | |
54 | * information to the end of cmd.data, then you must introduce a new | |
55 | * LXC_CMD_GET_CONFIG_ITEM_V2 define with a new number. You may wish to also | |
56 | * mark LXC_CMD_GET_CONFIG_ITEM deprecated in commands.h. | |
80bcb053 SH |
57 | * |
58 | * This is necessary in order to avoid having a newly compiled lxc command | |
59 | * communicating with a running (old) monitor from crashing the running | |
60 | * container. | |
ded1d23f DL |
61 | */ |
62 | ||
ac2cecc4 | 63 | lxc_log_define(commands, lxc); |
724e753c | 64 | |
ef6e34ee | 65 | static const char *lxc_cmd_str(lxc_cmd_t cmd) |
724e753c | 66 | { |
fe84a562 | 67 | static const char *const cmdname[LXC_CMD_MAX] = { |
2a63b5cb CB |
68 | [LXC_CMD_CONSOLE] = "console", |
69 | [LXC_CMD_TERMINAL_WINCH] = "terminal_winch", | |
70 | [LXC_CMD_STOP] = "stop", | |
71 | [LXC_CMD_GET_STATE] = "get_state", | |
72 | [LXC_CMD_GET_INIT_PID] = "get_init_pid", | |
73 | [LXC_CMD_GET_CLONE_FLAGS] = "get_clone_flags", | |
74 | [LXC_CMD_GET_CGROUP] = "get_cgroup", | |
75 | [LXC_CMD_GET_CONFIG_ITEM] = "get_config_item", | |
76 | [LXC_CMD_GET_NAME] = "get_name", | |
77 | [LXC_CMD_GET_LXCPATH] = "get_lxcpath", | |
78 | [LXC_CMD_ADD_STATE_CLIENT] = "add_state_client", | |
79 | [LXC_CMD_CONSOLE_LOG] = "console_log", | |
80 | [LXC_CMD_SERVE_STATE_CLIENTS] = "serve_state_clients", | |
81 | [LXC_CMD_SECCOMP_NOTIFY_ADD_LISTENER] = "seccomp_notify_add_listener", | |
82 | [LXC_CMD_ADD_BPF_DEVICE_CGROUP] = "add_bpf_device_cgroup", | |
018051e3 CB |
83 | [LXC_CMD_FREEZE] = "freeze", |
84 | [LXC_CMD_UNFREEZE] = "unfreeze", | |
bad788b0 | 85 | [LXC_CMD_GET_CGROUP2_FD] = "get_cgroup2_fd", |
746aab51 | 86 | [LXC_CMD_GET_INIT_PIDFD] = "get_init_pidfd", |
ef6e34ee | 87 | }; |
724e753c | 88 | |
f371aca9 | 89 | if (cmd >= LXC_CMD_MAX) |
a8007512 | 90 | return "Invalid request"; |
fe84a562 | 91 | |
ef6e34ee DE |
92 | return cmdname[cmd]; |
93 | } | |
94 | ||
95 | /* | |
96 | * lxc_cmd_rsp_recv: Receive a response to a command | |
97 | * | |
98 | * @sock : the socket connected to the container | |
99 | * @cmd : command to put response in | |
100 | * | |
101 | * Returns the size of the response message or < 0 on failure | |
102 | * | |
103 | * Note that if the command response datalen > 0, then data is | |
104 | * a malloc()ed buffer and should be free()ed by the caller. If | |
105 | * the response data is <= a void * worth of data, it will be | |
106 | * stored directly in data and datalen will be 0. | |
107 | * | |
108 | * As a special case, the response for LXC_CMD_CONSOLE is created | |
0115f8fd DE |
109 | * here as it contains an fd for the master pty passed through the |
110 | * unix socket. | |
ef6e34ee DE |
111 | */ |
112 | static int lxc_cmd_rsp_recv(int sock, struct lxc_cmd_rr *cmd) | |
113 | { | |
f62cf1d4 | 114 | __do_close int fd_rsp = -EBADF; |
23a917e5 | 115 | int ret; |
ef6e34ee DE |
116 | struct lxc_cmd_rsp *rsp = &cmd->rsp; |
117 | ||
23a917e5 CB |
118 | ret = lxc_abstract_unix_recv_fds(sock, &fd_rsp, 1, rsp, sizeof(*rsp)); |
119 | if (ret < 0) | |
120 | return log_warn_errno(-1, | |
121 | errno, "Failed to receive response for command \"%s\"", | |
122 | lxc_cmd_str(cmd->req.cmd)); | |
fe84a562 | 123 | TRACE("Command \"%s\" received response", lxc_cmd_str(cmd->req.cmd)); |
ef6e34ee DE |
124 | |
125 | if (cmd->req.cmd == LXC_CMD_CONSOLE) { | |
126 | struct lxc_cmd_console_rsp_data *rspdata; | |
127 | ||
0115f8fd DE |
128 | /* recv() returns 0 bytes when a tty cannot be allocated, |
129 | * rsp->ret is < 0 when the peer permission check failed | |
130 | */ | |
131 | if (ret == 0 || rsp->ret < 0) | |
132 | return 0; | |
133 | ||
ef6e34ee | 134 | rspdata = malloc(sizeof(*rspdata)); |
23a917e5 CB |
135 | if (!rspdata) |
136 | return log_warn_errno(-1, | |
137 | ENOMEM, "Failed to receive response for command \"%s\"", | |
138 | lxc_cmd_str(cmd->req.cmd)); | |
2a850b2c | 139 | |
23a917e5 | 140 | rspdata->masterfd = move_fd(fd_rsp); |
ef6e34ee DE |
141 | rspdata->ttynum = PTR_TO_INT(rsp->data); |
142 | rsp->data = rspdata; | |
143 | } | |
144 | ||
23a917e5 CB |
145 | if (cmd->req.cmd == LXC_CMD_GET_CGROUP2_FD) { |
146 | int cgroup2_fd = move_fd(fd_rsp); | |
147 | rsp->data = INT_TO_PTR(cgroup2_fd); | |
860e7c43 | 148 | } |
fe84a562 | 149 | |
746aab51 CB |
150 | if (cmd->req.cmd == LXC_CMD_GET_INIT_PIDFD) { |
151 | int init_pidfd = move_fd(fd_rsp); | |
152 | rsp->data = INT_TO_PTR(init_pidfd); | |
153 | } | |
154 | ||
23a917e5 CB |
155 | if (rsp->datalen == 0) |
156 | return log_debug(ret, | |
157 | "Response data length for command \"%s\" is 0", | |
158 | lxc_cmd_str(cmd->req.cmd)); | |
159 | ||
191d43cc | 160 | if ((rsp->datalen > LXC_CMD_DATA_MAX) && |
23a917e5 CB |
161 | (cmd->req.cmd != LXC_CMD_CONSOLE_LOG)) |
162 | return log_error(-1, "Response data for command \"%s\" is too long: %d bytes > %d", | |
163 | lxc_cmd_str(cmd->req.cmd), rsp->datalen, | |
164 | LXC_CMD_DATA_MAX); | |
ef6e34ee | 165 | |
191d43cc CB |
166 | if (cmd->req.cmd == LXC_CMD_CONSOLE_LOG) { |
167 | rsp->data = malloc(rsp->datalen + 1); | |
168 | ((char *)rsp->data)[rsp->datalen] = '\0'; | |
169 | } else { | |
170 | rsp->data = malloc(rsp->datalen); | |
171 | } | |
23a917e5 CB |
172 | if (!rsp->data) |
173 | return log_error_errno(-1, | |
174 | ENOMEM, "Failed to allocate response buffer for command \"%s\"", | |
175 | lxc_cmd_str(cmd->req.cmd)); | |
fe84a562 | 176 | |
2a850b2c | 177 | ret = lxc_recv_nointr(sock, rsp->data, rsp->datalen, 0); |
23a917e5 CB |
178 | if (ret != rsp->datalen) |
179 | return log_error_errno(-1, | |
180 | errno, "Failed to receive response data for command \"%s\"", | |
181 | lxc_cmd_str(cmd->req.cmd)); | |
724e753c MN |
182 | |
183 | return ret; | |
184 | } | |
185 | ||
ef6e34ee DE |
186 | /* |
187 | * lxc_cmd_rsp_send: Send a command response | |
188 | * | |
189 | * @fd : file descriptor of socket to send response on | |
190 | * @rsp : response to send | |
191 | * | |
192 | * Returns 0 on success, < 0 on failure | |
193 | */ | |
194 | static int lxc_cmd_rsp_send(int fd, struct lxc_cmd_rsp *rsp) | |
195 | { | |
fe84a562 | 196 | ssize_t ret; |
ef6e34ee | 197 | |
7fbb15ec CB |
198 | errno = EMSGSIZE; |
199 | ret = lxc_send_nointr(fd, rsp, sizeof(*rsp), MSG_NOSIGNAL); | |
6c6497ea CB |
200 | if (ret < 0 || (size_t)ret != sizeof(*rsp)) |
201 | return log_error_errno(-1, errno, "Failed to send command response %zd", ret); | |
ef6e34ee | 202 | |
a674dfe1 | 203 | if (!rsp->data || rsp->datalen <= 0) |
fe84a562 CB |
204 | return 0; |
205 | ||
7fbb15ec CB |
206 | errno = EMSGSIZE; |
207 | ret = lxc_send_nointr(fd, rsp->data, rsp->datalen, MSG_NOSIGNAL); | |
6c6497ea CB |
208 | if (ret < 0 || ret != (ssize_t)rsp->datalen) |
209 | return log_warn_errno(-1, errno, "Failed to send command response data %zd", ret); | |
fe84a562 | 210 | |
ef6e34ee DE |
211 | return 0; |
212 | } | |
213 | ||
c01c2be6 | 214 | static int lxc_cmd_send(const char *name, struct lxc_cmd_rr *cmd, |
fe84a562 | 215 | const char *lxcpath, const char *hashed_sock_name) |
c01c2be6 | 216 | { |
f62cf1d4 | 217 | __do_close int client_fd = -EBADF; |
fe84a562 | 218 | ssize_t ret = -1; |
c01c2be6 | 219 | |
9dfa4041 | 220 | client_fd = lxc_cmd_connect(name, lxcpath, hashed_sock_name, "command"); |
2a850b2c | 221 | if (client_fd < 0) |
fe84a562 | 222 | return -1; |
c01c2be6 | 223 | |
fe84a562 CB |
224 | ret = lxc_abstract_unix_send_credential(client_fd, &cmd->req, |
225 | sizeof(cmd->req)); | |
2a850b2c | 226 | if (ret < 0 || (size_t)ret != sizeof(cmd->req)) |
e96f9291 | 227 | return -1; |
9044b79e | 228 | |
cdb2a47f CB |
229 | if (cmd->req.cmd == LXC_CMD_SECCOMP_NOTIFY_ADD_LISTENER) { |
230 | int notify_fd = PTR_TO_INT(cmd->req.data); | |
231 | ret = lxc_abstract_unix_send_fds(client_fd, ¬ify_fd, 1, NULL, 0); | |
232 | if (ret <= 0) | |
233 | return -1; | |
234 | } else { | |
235 | if (cmd->req.datalen <= 0) | |
236 | return move_fd(client_fd); | |
c01c2be6 | 237 | |
cdb2a47f CB |
238 | errno = EMSGSIZE; |
239 | ret = lxc_send_nointr(client_fd, (void *)cmd->req.data, | |
240 | cmd->req.datalen, MSG_NOSIGNAL); | |
241 | if (ret < 0 || ret != (ssize_t)cmd->req.datalen) | |
242 | return -1; | |
243 | } | |
c01c2be6 | 244 | |
240fecd0 | 245 | return move_fd(client_fd); |
c01c2be6 CB |
246 | } |
247 | ||
ef6e34ee DE |
248 | /* |
249 | * lxc_cmd: Connect to the specified running container, send it a command | |
250 | * request and collect the response | |
251 | * | |
252 | * @name : name of container to connect to | |
1e8cfdf6 | 253 | * @cmd : command with initialized request to send |
ef6e34ee DE |
254 | * @stopped : output indicator if the container was not running |
255 | * @lxcpath : the lxcpath in which the container is running | |
256 | * | |
257 | * Returns the size of the response message on success, < 0 on failure | |
258 | * | |
259 | * Note that there is a special case for LXC_CMD_CONSOLE. For this command | |
260 | * the fd cannot be closed because it is used as a placeholder to indicate | |
261 | * that a particular tty slot is in use. The fd is also used as a signal to | |
262 | * the container that when the caller dies or closes the fd, the container | |
0115f8fd DE |
263 | * will notice the fd on its side of the socket in its mainloop select and |
264 | * then free the slot with lxc_cmd_fd_cleanup(). The socket fd will be | |
265 | * returned in the cmd response structure. | |
ef6e34ee DE |
266 | */ |
267 | static int lxc_cmd(const char *name, struct lxc_cmd_rr *cmd, int *stopped, | |
88556fd7 | 268 | const char *lxcpath, const char *hashed_sock_name) |
724e753c | 269 | { |
f62cf1d4 | 270 | __do_close int client_fd = -EBADF; |
fe84a562 | 271 | int ret = -1; |
dbc9832d CB |
272 | bool stay_connected = false; |
273 | ||
274 | if (cmd->req.cmd == LXC_CMD_CONSOLE || | |
54446942 | 275 | cmd->req.cmd == LXC_CMD_ADD_STATE_CLIENT) |
dbc9832d | 276 | stay_connected = true; |
724e753c | 277 | |
0ecf64b5 SH |
278 | *stopped = 0; |
279 | ||
c01c2be6 CB |
280 | client_fd = lxc_cmd_send(name, cmd, lxcpath, hashed_sock_name); |
281 | if (client_fd < 0) { | |
00e5ca13 | 282 | if (errno == ECONNREFUSED || errno == EPIPE) |
ef6e34ee | 283 | *stopped = 1; |
3f903c04 | 284 | |
6c6497ea CB |
285 | return log_trace_errno(-1, errno, "Command \"%s\" failed to connect command socket", |
286 | lxc_cmd_str(cmd->req.cmd)); | |
724e753c MN |
287 | } |
288 | ||
c01c2be6 | 289 | ret = lxc_cmd_rsp_recv(client_fd, cmd); |
2a850b2c | 290 | if (ret < 0 && errno == ECONNRESET) |
6b7f85cb | 291 | *stopped = 1; |
6a93ae77 | 292 | |
ea2a070b CB |
293 | TRACE("Opened new command socket connection fd %d for command \"%s\"", |
294 | client_fd, lxc_cmd_str(cmd->req.cmd)); | |
295 | ||
c34ff119 | 296 | if (stay_connected && ret > 0) |
240fecd0 | 297 | cmd->rsp.ret = move_fd(client_fd); |
43eb6f29 | 298 | |
1362f2eb | 299 | return ret; |
724e753c MN |
300 | } |
301 | ||
b494d2dd SH |
302 | int lxc_try_cmd(const char *name, const char *lxcpath) |
303 | { | |
0ecf64b5 | 304 | int stopped, ret; |
b494d2dd SH |
305 | struct lxc_cmd_rr cmd = { |
306 | .req = { .cmd = LXC_CMD_GET_INIT_PID }, | |
307 | }; | |
308 | ||
88556fd7 | 309 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
b494d2dd SH |
310 | if (stopped) |
311 | return 0; | |
312 | if (ret > 0 && cmd.rsp.ret < 0) { | |
313 | errno = cmd.rsp.ret; | |
314 | return -1; | |
315 | } | |
316 | if (ret > 0) | |
317 | return 0; | |
318 | ||
fe84a562 CB |
319 | /* At this point we weren't denied access, and the container *was* |
320 | * started. There was some inexplicable error in the protocol. I'm not | |
321 | * clear on whether we should return -1 here, but we didn't receive a | |
322 | * -EACCES, so technically it's not that we're not allowed to control | |
323 | * the container - it's just not behaving. | |
b494d2dd SH |
324 | */ |
325 | return 0; | |
326 | } | |
327 | ||
e6bc68d6 WB |
328 | /* |
329 | * Validate that the input is a proper string parameter. If not, | |
330 | * send an EINVAL response and return -1. | |
331 | * | |
332 | * Precondition: there is non-zero-length data available. | |
333 | */ | |
334 | static int validate_string_request(int fd, const struct lxc_cmd_req *req) | |
335 | { | |
336 | int ret; | |
337 | size_t maxlen = req->datalen - 1; | |
338 | const char *data = req->data; | |
339 | ||
340 | if (data[maxlen] == 0 && strnlen(data, maxlen) == maxlen) | |
341 | return 0; | |
342 | ||
343 | struct lxc_cmd_rsp rsp = { | |
344 | .ret = -EINVAL, | |
345 | .datalen = 0, | |
346 | .data = NULL, | |
347 | }; | |
348 | ||
349 | ret = lxc_cmd_rsp_send(fd, &rsp); | |
350 | if (ret < 0) | |
351 | return LXC_CMD_REAP_CLIENT_FD; | |
352 | ||
353 | return -1; | |
354 | } | |
355 | ||
cc4c0832 | 356 | /* Implementations of the commands and their callbacks */ |
ef6e34ee DE |
357 | |
358 | /* | |
359 | * lxc_cmd_get_init_pid: Get pid of the container's init process | |
360 | * | |
361 | * @name : name of container to connect to | |
362 | * @lxcpath : the lxcpath in which the container is running | |
363 | * | |
364 | * Returns the pid on success, < 0 on failure | |
365 | */ | |
366 | pid_t lxc_cmd_get_init_pid(const char *name, const char *lxcpath) | |
43eb6f29 | 367 | { |
0ecf64b5 | 368 | int ret, stopped; |
565eb353 | 369 | pid_t pid = -1; |
ef6e34ee | 370 | struct lxc_cmd_rr cmd = { |
e8cd1208 CB |
371 | .req = { |
372 | .cmd = LXC_CMD_GET_INIT_PID | |
373 | }, | |
374 | .rsp = { | |
565eb353 | 375 | .data = PID_TO_PTR(pid) |
e8cd1208 | 376 | } |
ef6e34ee DE |
377 | }; |
378 | ||
88556fd7 | 379 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee | 380 | if (ret < 0) |
8ed8a626 | 381 | return -1; |
ef6e34ee | 382 | |
565eb353 | 383 | pid = PTR_TO_PID(cmd.rsp.data); |
9234406b CB |
384 | if (pid < 0) |
385 | return -1; | |
386 | ||
387 | /* We need to assume that pid_t can actually hold any pid given to us | |
388 | * by the kernel. If it can't it's a libc bug. | |
389 | */ | |
390 | return (pid_t)pid; | |
43eb6f29 DL |
391 | } |
392 | ||
ef6e34ee | 393 | static int lxc_cmd_get_init_pid_callback(int fd, struct lxc_cmd_req *req, |
cdb2a47f CB |
394 | struct lxc_handler *handler, |
395 | struct lxc_epoll_descr *descr) | |
43eb6f29 | 396 | { |
ea2a070b | 397 | int ret; |
9234406b | 398 | struct lxc_cmd_rsp rsp = { |
565eb353 | 399 | .data = PID_TO_PTR(handler->pid) |
9234406b | 400 | }; |
ef6e34ee | 401 | |
ea2a070b CB |
402 | ret = lxc_cmd_rsp_send(fd, &rsp); |
403 | if (ret < 0) | |
404 | return LXC_CMD_REAP_CLIENT_FD; | |
405 | ||
406 | return 0; | |
43eb6f29 DL |
407 | } |
408 | ||
746aab51 CB |
409 | int lxc_cmd_get_init_pidfd(const char *name, const char *lxcpath) |
410 | { | |
411 | int ret, stopped; | |
412 | struct lxc_cmd_rr cmd = { | |
413 | .req = { | |
414 | .cmd = LXC_CMD_GET_INIT_PIDFD, | |
415 | }, | |
416 | }; | |
417 | ||
418 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
419 | if (ret < 0) | |
420 | return log_debug_errno(-1, errno, "Failed to process init pidfd command"); | |
421 | ||
422 | if (cmd.rsp.ret < 0) | |
423 | return log_debug_errno(-EBADF, errno, "Failed to receive init pidfd"); | |
424 | ||
425 | return PTR_TO_INT(cmd.rsp.data); | |
426 | } | |
427 | ||
428 | static int lxc_cmd_get_init_pidfd_callback(int fd, struct lxc_cmd_req *req, | |
429 | struct lxc_handler *handler, | |
430 | struct lxc_epoll_descr *descr) | |
431 | { | |
432 | struct lxc_cmd_rsp rsp = { | |
433 | .ret = 0, | |
434 | }; | |
435 | int ret; | |
436 | ||
437 | if (handler->pidfd < 0) | |
438 | rsp.ret = -EBADF; | |
439 | ret = lxc_abstract_unix_send_fds(fd, &handler->pidfd, 1, &rsp, sizeof(rsp)); | |
440 | if (ret < 0) | |
441 | return log_error(LXC_CMD_REAP_CLIENT_FD, "Failed to send init pidfd"); | |
442 | ||
443 | return 0; | |
444 | } | |
445 | ||
ef6e34ee DE |
446 | /* |
447 | * lxc_cmd_get_clone_flags: Get clone flags container was spawned with | |
448 | * | |
449 | * @name : name of container to connect to | |
450 | * @lxcpath : the lxcpath in which the container is running | |
451 | * | |
452 | * Returns the clone flags on success, < 0 on failure | |
453 | */ | |
454 | int lxc_cmd_get_clone_flags(const char *name, const char *lxcpath) | |
455 | { | |
0ecf64b5 | 456 | int ret, stopped; |
ef6e34ee | 457 | struct lxc_cmd_rr cmd = { |
6c6497ea CB |
458 | .req = { |
459 | .cmd = LXC_CMD_GET_CLONE_FLAGS, | |
460 | }, | |
ef6e34ee DE |
461 | }; |
462 | ||
88556fd7 | 463 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee DE |
464 | if (ret < 0) |
465 | return ret; | |
43eb6f29 | 466 | |
ef6e34ee DE |
467 | return PTR_TO_INT(cmd.rsp.data); |
468 | } | |
469 | ||
470 | static int lxc_cmd_get_clone_flags_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
471 | struct lxc_handler *handler, |
472 | struct lxc_epoll_descr *descr) | |
26b2d152 | 473 | { |
ea2a070b | 474 | int ret; |
6c6497ea CB |
475 | struct lxc_cmd_rsp rsp = { |
476 | .data = INT_TO_PTR(handler->ns_clone_flags), | |
477 | }; | |
ef6e34ee | 478 | |
ea2a070b CB |
479 | ret = lxc_cmd_rsp_send(fd, &rsp); |
480 | if (ret < 0) | |
481 | return LXC_CMD_REAP_CLIENT_FD; | |
482 | ||
483 | return 0; | |
ef6e34ee DE |
484 | } |
485 | ||
486 | /* | |
487 | * lxc_cmd_get_cgroup_path: Calculate a container's cgroup path for a | |
488 | * particular subsystem. This is the cgroup path relative to the root | |
489 | * of the cgroup filesystem. | |
490 | * | |
ef6e34ee DE |
491 | * @name : name of container to connect to |
492 | * @lxcpath : the lxcpath in which the container is running | |
b98f7d6e | 493 | * @subsystem : the subsystem being asked about |
ef6e34ee DE |
494 | * |
495 | * Returns the path on success, NULL on failure. The caller must free() the | |
496 | * returned path. | |
497 | */ | |
b98f7d6e | 498 | char *lxc_cmd_get_cgroup_path(const char *name, const char *lxcpath, |
fe84a562 | 499 | const char *subsystem) |
ef6e34ee | 500 | { |
0ecf64b5 | 501 | int ret, stopped; |
ef6e34ee | 502 | struct lxc_cmd_rr cmd = { |
b98f7d6e SH |
503 | .req = { |
504 | .cmd = LXC_CMD_GET_CGROUP, | |
b98f7d6e | 505 | .data = subsystem, |
c2aed66d | 506 | .datalen = 0, |
b98f7d6e | 507 | }, |
26b2d152 MN |
508 | }; |
509 | ||
c2aed66d CB |
510 | cmd.req.data = subsystem; |
511 | cmd.req.datalen = 0; | |
512 | if (subsystem) | |
513 | cmd.req.datalen = strlen(subsystem) + 1; | |
514 | ||
88556fd7 | 515 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
fe84a562 | 516 | if (ret < 0) |
ef6e34ee DE |
517 | return NULL; |
518 | ||
fe84a562 | 519 | if (ret == 0) |
ef6e34ee | 520 | return NULL; |
ef6e34ee | 521 | |
fe84a562 | 522 | if (cmd.rsp.ret < 0 || cmd.rsp.datalen < 0) |
ef6e34ee | 523 | return NULL; |
3f903c04 | 524 | |
ef6e34ee DE |
525 | return cmd.rsp.data; |
526 | } | |
527 | ||
528 | static int lxc_cmd_get_cgroup_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
529 | struct lxc_handler *handler, |
530 | struct lxc_epoll_descr *descr) | |
ef6e34ee | 531 | { |
ea2a070b | 532 | int ret; |
4fb3cba5 | 533 | const char *path; |
fe84a562 | 534 | struct lxc_cmd_rsp rsp; |
2202afc9 | 535 | struct cgroup_ops *cgroup_ops = handler->cgroup_ops; |
b98f7d6e | 536 | |
e6bc68d6 WB |
537 | if (req->datalen > 0) { |
538 | ret = validate_string_request(fd, req); | |
539 | if (ret != 0) | |
540 | return ret; | |
541 | ||
2202afc9 | 542 | path = cgroup_ops->get_cgroup(cgroup_ops, req->data); |
e6bc68d6 | 543 | } else { |
2202afc9 | 544 | path = cgroup_ops->get_cgroup(cgroup_ops, NULL); |
e6bc68d6 | 545 | } |
b98f7d6e SH |
546 | if (!path) |
547 | return -1; | |
fe84a562 | 548 | |
4f17323e | 549 | rsp.ret = 0; |
fe84a562 CB |
550 | rsp.datalen = strlen(path) + 1; |
551 | rsp.data = (char *)path; | |
ef6e34ee | 552 | |
ea2a070b CB |
553 | ret = lxc_cmd_rsp_send(fd, &rsp); |
554 | if (ret < 0) | |
555 | return LXC_CMD_REAP_CLIENT_FD; | |
556 | ||
557 | return 0; | |
ef6e34ee DE |
558 | } |
559 | ||
560 | /* | |
561 | * lxc_cmd_get_config_item: Get config item the running container | |
562 | * | |
563 | * @name : name of container to connect to | |
7fa3f2e9 | 564 | * @item : the configuration item to retrieve (ex: lxc.net.0.veth.pair) |
ef6e34ee DE |
565 | * @lxcpath : the lxcpath in which the container is running |
566 | * | |
567 | * Returns the item on success, NULL on failure. The caller must free() the | |
568 | * returned item. | |
569 | */ | |
570 | char *lxc_cmd_get_config_item(const char *name, const char *item, | |
571 | const char *lxcpath) | |
572 | { | |
0ecf64b5 | 573 | int ret, stopped; |
ef6e34ee DE |
574 | struct lxc_cmd_rr cmd = { |
575 | .req = { .cmd = LXC_CMD_GET_CONFIG_ITEM, | |
576 | .data = item, | |
fe84a562 | 577 | .datalen = strlen(item) + 1, |
ef6e34ee DE |
578 | }, |
579 | }; | |
580 | ||
88556fd7 | 581 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee DE |
582 | if (ret < 0) |
583 | return NULL; | |
584 | ||
585 | if (cmd.rsp.ret == 0) | |
586 | return cmd.rsp.data; | |
fe84a562 | 587 | |
ef6e34ee DE |
588 | return NULL; |
589 | } | |
590 | ||
591 | static int lxc_cmd_get_config_item_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
592 | struct lxc_handler *handler, |
593 | struct lxc_epoll_descr *descr) | |
ef6e34ee | 594 | { |
5265a60c | 595 | __do_free char *cidata = NULL; |
ef6e34ee | 596 | int cilen; |
30aec088 | 597 | struct lxc_config_t *item; |
fe84a562 | 598 | struct lxc_cmd_rsp rsp; |
ef6e34ee DE |
599 | |
600 | memset(&rsp, 0, sizeof(rsp)); | |
300df83e | 601 | item = lxc_get_config(req->data); |
30aec088 CB |
602 | if (!item) |
603 | goto err1; | |
fe84a562 | 604 | |
cccd2219 | 605 | cilen = item->get(req->data, NULL, 0, handler->conf, NULL); |
ef6e34ee DE |
606 | if (cilen <= 0) |
607 | goto err1; | |
608 | ||
5265a60c | 609 | cidata = must_realloc(NULL, cilen + 1); |
cccd2219 | 610 | if (item->get(req->data, cidata, cilen + 1, handler->conf, NULL) != cilen) |
ef6e34ee | 611 | goto err1; |
fe84a562 | 612 | |
ef6e34ee DE |
613 | cidata[cilen] = '\0'; |
614 | rsp.data = cidata; | |
615 | rsp.datalen = cilen + 1; | |
616 | rsp.ret = 0; | |
617 | goto out; | |
618 | ||
619 | err1: | |
620 | rsp.ret = -1; | |
621 | out: | |
ea2a070b CB |
622 | cilen = lxc_cmd_rsp_send(fd, &rsp); |
623 | if (cilen < 0) | |
624 | return LXC_CMD_REAP_CLIENT_FD; | |
625 | ||
626 | return 0; | |
ef6e34ee DE |
627 | } |
628 | ||
629 | /* | |
630 | * lxc_cmd_get_state: Get current state of the container | |
631 | * | |
632 | * @name : name of container to connect to | |
633 | * @lxcpath : the lxcpath in which the container is running | |
634 | * | |
635 | * Returns the state on success, < 0 on failure | |
636 | */ | |
dbc9832d | 637 | int lxc_cmd_get_state(const char *name, const char *lxcpath) |
ef6e34ee | 638 | { |
0ecf64b5 | 639 | int ret, stopped; |
ef6e34ee | 640 | struct lxc_cmd_rr cmd = { |
6c6497ea CB |
641 | .req = { |
642 | .cmd = LXC_CMD_GET_STATE, | |
643 | }, | |
ef6e34ee | 644 | }; |
26b2d152 | 645 | |
88556fd7 | 646 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ebdd307d | 647 | if (ret < 0 && stopped) |
ef6e34ee DE |
648 | return STOPPED; |
649 | ||
650 | if (ret < 0) | |
26b2d152 | 651 | return -1; |
26b2d152 | 652 | |
6c6497ea CB |
653 | if (!ret) |
654 | return log_warn(-1, "Container \"%s\" has stopped before sending its state", name); | |
fe84a562 | 655 | |
6c6497ea CB |
656 | return log_debug(PTR_TO_INT(cmd.rsp.data), |
657 | "Container \"%s\" is in \"%s\" state", name, | |
658 | lxc_state2str(PTR_TO_INT(cmd.rsp.data))); | |
ef6e34ee DE |
659 | } |
660 | ||
661 | static int lxc_cmd_get_state_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
662 | struct lxc_handler *handler, |
663 | struct lxc_epoll_descr *descr) | |
ef6e34ee | 664 | { |
ea2a070b | 665 | int ret; |
6c6497ea CB |
666 | struct lxc_cmd_rsp rsp = { |
667 | .data = INT_TO_PTR(handler->state), | |
668 | }; | |
ef6e34ee | 669 | |
ea2a070b CB |
670 | ret = lxc_cmd_rsp_send(fd, &rsp); |
671 | if (ret < 0) | |
672 | return LXC_CMD_REAP_CLIENT_FD; | |
673 | ||
674 | return 0; | |
ef6e34ee DE |
675 | } |
676 | ||
677 | /* | |
678 | * lxc_cmd_stop: Stop the container previously started with lxc_start. All | |
679 | * the processes running inside this container will be killed. | |
680 | * | |
681 | * @name : name of container to connect to | |
682 | * @lxcpath : the lxcpath in which the container is running | |
683 | * | |
684 | * Returns 0 on success, < 0 on failure | |
685 | */ | |
686 | int lxc_cmd_stop(const char *name, const char *lxcpath) | |
687 | { | |
0ecf64b5 | 688 | int ret, stopped; |
ef6e34ee | 689 | struct lxc_cmd_rr cmd = { |
6c6497ea CB |
690 | .req = { |
691 | .cmd = LXC_CMD_STOP, | |
692 | }, | |
ef6e34ee DE |
693 | }; |
694 | ||
88556fd7 | 695 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
26b2d152 | 696 | if (ret < 0) { |
6c6497ea CB |
697 | if (stopped) |
698 | return log_info(0, "Container \"%s\" is already stopped", name); | |
fe84a562 | 699 | |
26b2d152 MN |
700 | return -1; |
701 | } | |
702 | ||
fe84a562 CB |
703 | /* We do not expect any answer, because we wait for the connection to be |
704 | * closed. | |
95d5b147 | 705 | */ |
6c6497ea CB |
706 | if (ret > 0) |
707 | return log_error_errno(-1, -cmd.rsp.ret, "Failed to stop container \"%s\"", name); | |
26b2d152 | 708 | |
6c6497ea | 709 | return log_info(0, "Container \"%s\" has stopped", name); |
26b2d152 MN |
710 | } |
711 | ||
ef6e34ee | 712 | static int lxc_cmd_stop_callback(int fd, struct lxc_cmd_req *req, |
cdb2a47f CB |
713 | struct lxc_handler *handler, |
714 | struct lxc_epoll_descr *descr) | |
d5088cf2 | 715 | { |
ef6e34ee | 716 | struct lxc_cmd_rsp rsp; |
ef6e34ee | 717 | int stopsignal = SIGKILL; |
2202afc9 | 718 | struct cgroup_ops *cgroup_ops = handler->cgroup_ops; |
ea2a070b | 719 | int ret; |
ef6e34ee DE |
720 | |
721 | if (handler->conf->stopsignal) | |
722 | stopsignal = handler->conf->stopsignal; | |
723 | memset(&rsp, 0, sizeof(rsp)); | |
9837ee46 | 724 | |
8ad4fa68 | 725 | if (handler->pidfd >= 0) |
9837ee46 CB |
726 | rsp.ret = lxc_raw_pidfd_send_signal(handler->pidfd, stopsignal, NULL, 0); |
727 | else | |
728 | rsp.ret = kill(handler->pid, stopsignal); | |
ef6e34ee | 729 | if (!rsp.ret) { |
9837ee46 CB |
730 | if (handler->pidfd >= 0) |
731 | TRACE("Sent signal %d to pidfd %d", stopsignal, handler->pidfd); | |
732 | else | |
733 | TRACE("Sent signal %d to pidfd %d", stopsignal, handler->pid); | |
734 | ||
018051e3 CB |
735 | rsp.ret = cgroup_ops->unfreeze(cgroup_ops, -1); |
736 | if (!rsp.ret) | |
95d5b147 | 737 | return 0; |
fe84a562 CB |
738 | |
739 | ERROR("Failed to unfreeze container \"%s\"", handler->name); | |
018051e3 CB |
740 | rsp.ret = -errno; |
741 | } else { | |
742 | rsp.ret = -errno; | |
ef6e34ee DE |
743 | } |
744 | ||
ea2a070b CB |
745 | ret = lxc_cmd_rsp_send(fd, &rsp); |
746 | if (ret < 0) | |
747 | return LXC_CMD_REAP_CLIENT_FD; | |
748 | ||
749 | return 0; | |
ef6e34ee | 750 | } |
d5088cf2 | 751 | |
b5159817 | 752 | /* |
2bd158cc | 753 | * lxc_cmd_terminal_winch: noop |
b5159817 DE |
754 | * |
755 | * @name : name of container to connect to | |
756 | * @lxcpath : the lxcpath in which the container is running | |
757 | * | |
758 | * Returns 0 on success, < 0 on failure | |
759 | */ | |
8ccbbf94 | 760 | int lxc_cmd_terminal_winch(const char *name, const char *lxcpath) |
b5159817 | 761 | { |
b5159817 DE |
762 | return 0; |
763 | } | |
764 | ||
8ccbbf94 | 765 | static int lxc_cmd_terminal_winch_callback(int fd, struct lxc_cmd_req *req, |
cdb2a47f CB |
766 | struct lxc_handler *handler, |
767 | struct lxc_epoll_descr *descr) | |
b5159817 | 768 | { |
2bd158cc | 769 | /* should never be called */ |
6c6497ea | 770 | return log_error_errno(-1, ENOSYS, "Called lxc_cmd_terminal_winch_callback()"); |
b5159817 DE |
771 | } |
772 | ||
ef6e34ee DE |
773 | /* |
774 | * lxc_cmd_console: Open an fd to a tty in the container | |
775 | * | |
776 | * @name : name of container to connect to | |
777 | * @ttynum : in: the tty to open or -1 for next available | |
778 | * : out: the tty allocated | |
779 | * @fd : out: file descriptor for master side of pty | |
780 | * @lxcpath : the lxcpath in which the container is running | |
781 | * | |
0115f8fd | 782 | * Returns fd holding tty allocated on success, < 0 on failure |
ef6e34ee DE |
783 | */ |
784 | int lxc_cmd_console(const char *name, int *ttynum, int *fd, const char *lxcpath) | |
785 | { | |
8259d86d | 786 | __do_free struct lxc_cmd_console_rsp_data *rspdata = NULL; |
0ecf64b5 | 787 | int ret, stopped; |
ef6e34ee | 788 | struct lxc_cmd_rr cmd = { |
6c6497ea CB |
789 | .req = { |
790 | .cmd = LXC_CMD_CONSOLE, | |
791 | .data = INT_TO_PTR(*ttynum), | |
792 | }, | |
ef6e34ee | 793 | }; |
d5088cf2 | 794 | |
88556fd7 | 795 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
ef6e34ee DE |
796 | if (ret < 0) |
797 | return ret; | |
0115f8fd | 798 | |
8259d86d | 799 | rspdata = cmd.rsp.data; |
6c6497ea CB |
800 | if (cmd.rsp.ret < 0) |
801 | return log_error_errno(-1, -cmd.rsp.ret, "Denied access to tty"); | |
d5088cf2 | 802 | |
6c6497ea CB |
803 | if (ret == 0) |
804 | return log_error(-1, "tty number %d invalid, busy or all ttys busy", *ttynum); | |
ef6e34ee | 805 | |
6c6497ea CB |
806 | if (rspdata->masterfd < 0) |
807 | return log_error(-1, "Unable to allocate fd for tty %d", rspdata->ttynum); | |
ef6e34ee | 808 | |
fe84a562 | 809 | ret = cmd.rsp.ret; /* socket fd */ |
0115f8fd | 810 | *fd = rspdata->masterfd; |
ef6e34ee | 811 | *ttynum = rspdata->ttynum; |
fe84a562 | 812 | |
6c6497ea | 813 | return log_info(ret, "Alloced fd %d for tty %d via socket %d", *fd, rspdata->ttynum, ret); |
ef6e34ee DE |
814 | } |
815 | ||
816 | static int lxc_cmd_console_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
817 | struct lxc_handler *handler, |
818 | struct lxc_epoll_descr *descr) | |
ef6e34ee | 819 | { |
fe84a562 | 820 | int masterfd, ret; |
ef6e34ee | 821 | struct lxc_cmd_rsp rsp; |
fe84a562 | 822 | int ttynum = PTR_TO_INT(req->data); |
ef6e34ee | 823 | |
c1ee47cd | 824 | masterfd = lxc_terminal_allocate(handler->conf, fd, &ttynum); |
b5159817 | 825 | if (masterfd < 0) |
ea2a070b | 826 | return LXC_CMD_REAP_CLIENT_FD; |
ef6e34ee | 827 | |
ef6e34ee DE |
828 | memset(&rsp, 0, sizeof(rsp)); |
829 | rsp.data = INT_TO_PTR(ttynum); | |
fe84a562 CB |
830 | ret = lxc_abstract_unix_send_fds(fd, &masterfd, 1, &rsp, sizeof(rsp)); |
831 | if (ret < 0) { | |
3dfe6f8d | 832 | lxc_terminal_free(handler->conf, fd); |
ea2a070b CB |
833 | return log_error_errno(LXC_CMD_REAP_CLIENT_FD, errno, |
834 | "Failed to send tty to client"); | |
ef6e34ee DE |
835 | } |
836 | ||
ef6e34ee | 837 | return 0; |
d5088cf2 CS |
838 | } |
839 | ||
88556fd7 ÇO |
840 | /* |
841 | * lxc_cmd_get_name: Returns the name of the container | |
842 | * | |
843 | * @hashed_sock_name: hashed socket name | |
844 | * | |
845 | * Returns the name on success, NULL on failure. | |
846 | */ | |
847 | char *lxc_cmd_get_name(const char *hashed_sock_name) | |
848 | { | |
849 | int ret, stopped; | |
850 | struct lxc_cmd_rr cmd = { | |
6c6497ea CB |
851 | .req = { |
852 | .cmd = LXC_CMD_GET_NAME, | |
853 | }, | |
88556fd7 ÇO |
854 | }; |
855 | ||
856 | ret = lxc_cmd(NULL, &cmd, &stopped, NULL, hashed_sock_name); | |
fe84a562 | 857 | if (ret < 0) |
88556fd7 | 858 | return NULL; |
88556fd7 ÇO |
859 | |
860 | if (cmd.rsp.ret == 0) | |
861 | return cmd.rsp.data; | |
fe84a562 | 862 | |
88556fd7 ÇO |
863 | return NULL; |
864 | } | |
865 | ||
866 | static int lxc_cmd_get_name_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
867 | struct lxc_handler *handler, |
868 | struct lxc_epoll_descr *descr) | |
88556fd7 | 869 | { |
ea2a070b | 870 | int ret; |
88556fd7 ÇO |
871 | struct lxc_cmd_rsp rsp; |
872 | ||
873 | memset(&rsp, 0, sizeof(rsp)); | |
874 | ||
f0ecc19d | 875 | rsp.data = (char *)handler->name; |
88556fd7 ÇO |
876 | rsp.datalen = strlen(handler->name) + 1; |
877 | rsp.ret = 0; | |
878 | ||
ea2a070b CB |
879 | ret = lxc_cmd_rsp_send(fd, &rsp); |
880 | if (ret < 0) | |
881 | return LXC_CMD_REAP_CLIENT_FD; | |
882 | ||
883 | return 0; | |
88556fd7 ÇO |
884 | } |
885 | ||
886 | /* | |
887 | * lxc_cmd_get_lxcpath: Returns the lxcpath of the container | |
888 | * | |
889 | * @hashed_sock_name: hashed socket name | |
890 | * | |
891 | * Returns the lxcpath on success, NULL on failure. | |
892 | */ | |
893 | char *lxc_cmd_get_lxcpath(const char *hashed_sock_name) | |
894 | { | |
895 | int ret, stopped; | |
896 | struct lxc_cmd_rr cmd = { | |
6c6497ea CB |
897 | .req = { |
898 | .cmd = LXC_CMD_GET_LXCPATH, | |
899 | }, | |
88556fd7 | 900 | }; |
724e753c | 901 | |
88556fd7 | 902 | ret = lxc_cmd(NULL, &cmd, &stopped, NULL, hashed_sock_name); |
fe84a562 | 903 | if (ret < 0) |
88556fd7 | 904 | return NULL; |
88556fd7 ÇO |
905 | |
906 | if (cmd.rsp.ret == 0) | |
907 | return cmd.rsp.data; | |
fe84a562 | 908 | |
88556fd7 ÇO |
909 | return NULL; |
910 | } | |
911 | ||
912 | static int lxc_cmd_get_lxcpath_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
913 | struct lxc_handler *handler, |
914 | struct lxc_epoll_descr *descr) | |
88556fd7 | 915 | { |
ea2a070b | 916 | int ret; |
6c6497ea CB |
917 | struct lxc_cmd_rsp rsp = { |
918 | .ret = 0, | |
919 | .data = (char *)handler->lxcpath, | |
920 | .datalen = strlen(handler->lxcpath) + 1, | |
921 | }; | |
88556fd7 | 922 | |
ea2a070b CB |
923 | ret = lxc_cmd_rsp_send(fd, &rsp); |
924 | if (ret < 0) | |
925 | return LXC_CMD_REAP_CLIENT_FD; | |
926 | ||
927 | return 0; | |
88556fd7 | 928 | } |
ef6e34ee | 929 | |
54446942 | 930 | int lxc_cmd_add_state_client(const char *name, const char *lxcpath, |
92e35018 CB |
931 | lxc_state_t states[MAX_STATE], |
932 | int *state_client_fd) | |
dbc9832d | 933 | { |
f62cf1d4 | 934 | __do_close int clientfd = -EBADF; |
bc631984 | 935 | int state, stopped; |
dbc9832d | 936 | ssize_t ret; |
dbc9832d | 937 | struct lxc_cmd_rr cmd = { |
6c6497ea CB |
938 | .req = { |
939 | .cmd = LXC_CMD_ADD_STATE_CLIENT, | |
940 | .data = states, | |
941 | .datalen = (sizeof(lxc_state_t) * MAX_STATE) | |
942 | }, | |
dbc9832d CB |
943 | }; |
944 | ||
dbc9832d | 945 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); |
bc631984 CB |
946 | if (states[STOPPED] != 0 && stopped != 0) |
947 | return STOPPED; | |
948 | ||
dbc9832d | 949 | if (ret < 0) { |
f577e061 | 950 | if (errno != ECONNREFUSED) |
6d1400b5 | 951 | SYSERROR("Failed to execute command"); |
952 | ||
dbc9832d CB |
953 | return -1; |
954 | } | |
fe84a562 | 955 | |
dbc9832d CB |
956 | /* We should now be guaranteed to get an answer from the state sending |
957 | * function. | |
958 | */ | |
cd889e57 | 959 | clientfd = cmd.rsp.ret; |
6c6497ea CB |
960 | if (clientfd < 0) |
961 | return log_error_errno(-1, -clientfd, "Failed to receive socket fd"); | |
dbc9832d | 962 | |
bc631984 | 963 | state = PTR_TO_INT(cmd.rsp.data); |
6c6497ea CB |
964 | if (state < MAX_STATE) |
965 | return log_trace(state, "Container is already in requested state %s", lxc_state2str(state)); | |
bc631984 | 966 | |
240fecd0 | 967 | *state_client_fd = move_fd(clientfd); |
ea2a070b CB |
968 | TRACE("State connection fd %d ready to listen for container state changes", *state_client_fd); |
969 | return MAX_STATE; | |
dbc9832d CB |
970 | } |
971 | ||
ebbca852 | 972 | static int lxc_cmd_add_state_client_callback(__owns int fd, struct lxc_cmd_req *req, |
cdb2a47f CB |
973 | struct lxc_handler *handler, |
974 | struct lxc_epoll_descr *descr) | |
dbc9832d | 975 | { |
44552fb2 | 976 | int ret; |
dbc9832d | 977 | struct lxc_cmd_rsp rsp = {0}; |
dbc9832d | 978 | |
fe84a562 | 979 | if (req->datalen < 0) |
ea2a070b | 980 | return LXC_CMD_REAP_CLIENT_FD; |
dbc9832d | 981 | |
71fc9c04 | 982 | if (req->datalen != (sizeof(lxc_state_t) * MAX_STATE)) |
ea2a070b | 983 | return LXC_CMD_REAP_CLIENT_FD; |
dbc9832d | 984 | |
fe84a562 | 985 | if (!req->data) |
ea2a070b | 986 | return LXC_CMD_REAP_CLIENT_FD; |
dbc9832d | 987 | |
c01c2be6 | 988 | rsp.ret = lxc_add_state_client(fd, handler, (lxc_state_t *)req->data); |
44552fb2 | 989 | if (rsp.ret < 0) |
ea2a070b | 990 | return LXC_CMD_REAP_CLIENT_FD; |
44552fb2 | 991 | |
bc631984 | 992 | rsp.data = INT_TO_PTR(rsp.ret); |
dbc9832d | 993 | |
44552fb2 CB |
994 | ret = lxc_cmd_rsp_send(fd, &rsp); |
995 | if (ret < 0) | |
ea2a070b | 996 | return LXC_CMD_REAP_CLIENT_FD; |
44552fb2 CB |
997 | |
998 | return 0; | |
dbc9832d CB |
999 | } |
1000 | ||
2a63b5cb CB |
1001 | int lxc_cmd_add_bpf_device_cgroup(const char *name, const char *lxcpath, |
1002 | struct device_item *device) | |
1003 | { | |
1004 | #ifdef HAVE_STRUCT_BPF_CGROUP_DEV_CTX | |
1005 | int stopped = 0; | |
1006 | struct lxc_cmd_rr cmd = { | |
6c6497ea CB |
1007 | .req = { |
1008 | .cmd = LXC_CMD_ADD_BPF_DEVICE_CGROUP, | |
1009 | .data = device, | |
1010 | .datalen = sizeof(struct device_item), | |
1011 | }, | |
2a63b5cb CB |
1012 | }; |
1013 | int ret; | |
1014 | ||
1015 | if (strlen(device->access) > STRLITERALLEN("rwm")) | |
3d0327ed | 1016 | return log_error_errno(-1, EINVAL, "Invalid access mode specified %s", |
2a63b5cb CB |
1017 | device->access); |
1018 | ||
1019 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
1020 | if (ret < 0 || cmd.rsp.ret < 0) | |
3d0327ed | 1021 | return log_error_errno(-1, errno, "Failed to add new bpf device cgroup rule"); |
2a63b5cb CB |
1022 | |
1023 | return 0; | |
1024 | #else | |
3d0327ed | 1025 | return ret_set_errno(-1, ENOSYS); |
2a63b5cb CB |
1026 | #endif |
1027 | } | |
1028 | ||
1029 | static int lxc_cmd_add_bpf_device_cgroup_callback(int fd, struct lxc_cmd_req *req, | |
1030 | struct lxc_handler *handler, | |
1031 | struct lxc_epoll_descr *descr) | |
1032 | { | |
1033 | #ifdef HAVE_STRUCT_BPF_CGROUP_DEV_CTX | |
1034 | __do_bpf_program_free struct bpf_program *devices = NULL; | |
1035 | struct lxc_cmd_rsp rsp = {0}; | |
1036 | struct lxc_conf *conf = handler->conf; | |
1037 | struct hierarchy *unified = handler->cgroup_ops->unified; | |
2a63b5cb CB |
1038 | int ret; |
1039 | struct lxc_list *it; | |
1040 | struct device_item *device; | |
1041 | struct bpf_program *devices_old; | |
1042 | ||
1043 | if (req->datalen <= 0) | |
ea2a070b | 1044 | return LXC_CMD_REAP_CLIENT_FD; |
2a63b5cb CB |
1045 | |
1046 | if (req->datalen != sizeof(struct device_item)) | |
ea2a070b | 1047 | return LXC_CMD_REAP_CLIENT_FD; |
2a63b5cb CB |
1048 | |
1049 | if (!req->data) | |
ea2a070b | 1050 | return LXC_CMD_REAP_CLIENT_FD; |
2a63b5cb CB |
1051 | device = (struct device_item *)req->data; |
1052 | ||
1053 | rsp.ret = -1; | |
1054 | if (!unified) | |
1055 | goto respond; | |
1056 | ||
1057 | ret = bpf_list_add_device(conf, device); | |
1058 | if (ret < 0) | |
1059 | goto respond; | |
1060 | ||
1061 | devices = bpf_program_new(BPF_PROG_TYPE_CGROUP_DEVICE); | |
1062 | if (!devices) | |
1063 | goto respond; | |
1064 | ||
1065 | ret = bpf_program_init(devices); | |
1066 | if (ret) | |
1067 | goto respond; | |
1068 | ||
1069 | lxc_list_for_each(it, &conf->devices) { | |
1070 | struct device_item *cur = it->elem; | |
1071 | ||
1072 | ret = bpf_program_append_device(devices, cur); | |
1073 | if (ret) | |
1074 | goto respond; | |
1075 | } | |
1076 | ||
1077 | ret = bpf_program_finalize(devices); | |
1078 | if (ret) | |
1079 | goto respond; | |
1080 | ||
1081 | ret = bpf_program_cgroup_attach(devices, BPF_CGROUP_DEVICE, | |
1082 | unified->container_full_path, | |
1083 | BPF_F_ALLOW_MULTI); | |
1084 | if (ret) | |
1085 | goto respond; | |
1086 | ||
1087 | /* Replace old bpf program. */ | |
1088 | devices_old = move_ptr(conf->cgroup2_devices); | |
1089 | conf->cgroup2_devices = move_ptr(devices); | |
1090 | devices = move_ptr(devices_old); | |
1091 | ||
1092 | rsp.ret = 0; | |
1093 | ||
1094 | respond: | |
1095 | ret = lxc_cmd_rsp_send(fd, &rsp); | |
1096 | if (ret < 0) | |
ea2a070b | 1097 | return LXC_CMD_REAP_CLIENT_FD; |
2a63b5cb CB |
1098 | |
1099 | return 0; | |
2a63b5cb | 1100 | #else |
3d0327ed | 1101 | return ret_set_errno(-1, ENOSYS); |
2a63b5cb CB |
1102 | #endif |
1103 | } | |
1104 | ||
191d43cc CB |
1105 | int lxc_cmd_console_log(const char *name, const char *lxcpath, |
1106 | struct lxc_console_log *log) | |
1107 | { | |
1108 | int ret, stopped; | |
1109 | struct lxc_cmd_console_log data; | |
1110 | struct lxc_cmd_rr cmd; | |
1111 | ||
1112 | data.clear = log->clear; | |
1113 | data.read = log->read; | |
1114 | data.read_max = *log->read_max; | |
1115 | ||
1116 | cmd.req.cmd = LXC_CMD_CONSOLE_LOG; | |
1117 | cmd.req.data = &data; | |
1118 | cmd.req.datalen = sizeof(struct lxc_cmd_console_log); | |
1119 | ||
1120 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
1121 | if (ret < 0) | |
1122 | return ret; | |
1123 | ||
1124 | /* There is nothing to be read from the buffer. So clear any values we | |
1125 | * where passed to clearly indicate to the user that nothing went wrong. | |
1126 | */ | |
63b74cda | 1127 | if (cmd.rsp.ret == -ENODATA || cmd.rsp.ret == -EFAULT || cmd.rsp.ret == -ENOENT) { |
191d43cc CB |
1128 | *log->read_max = 0; |
1129 | log->data = NULL; | |
1130 | } | |
1131 | ||
1132 | /* This is a proper error so don't touch any values we were passed. */ | |
1133 | if (cmd.rsp.ret < 0) | |
1134 | return cmd.rsp.ret; | |
1135 | ||
1136 | *log->read_max = cmd.rsp.datalen; | |
1137 | log->data = cmd.rsp.data; | |
1138 | ||
1139 | return 0; | |
1140 | } | |
1141 | ||
1142 | static int lxc_cmd_console_log_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
1143 | struct lxc_handler *handler, |
1144 | struct lxc_epoll_descr *descr) | |
191d43cc CB |
1145 | { |
1146 | struct lxc_cmd_rsp rsp; | |
28f3b1cd | 1147 | uint64_t buffer_size = handler->conf->console.buffer_size; |
191d43cc CB |
1148 | const struct lxc_cmd_console_log *log = req->data; |
1149 | struct lxc_ringbuf *buf = &handler->conf->console.ringbuf; | |
1150 | ||
1151 | rsp.ret = -EFAULT; | |
1152 | rsp.datalen = 0; | |
1153 | rsp.data = NULL; | |
28f3b1cd | 1154 | if (buffer_size <= 0) |
191d43cc CB |
1155 | goto out; |
1156 | ||
5928191e CB |
1157 | if (log->read || log->write_logfile) |
1158 | rsp.datalen = lxc_ringbuf_used(buf); | |
1159 | ||
191d43cc CB |
1160 | if (log->read) |
1161 | rsp.data = lxc_ringbuf_get_read_addr(buf); | |
1162 | ||
1163 | if (log->read_max > 0 && (log->read_max <= rsp.datalen)) | |
1164 | rsp.datalen = log->read_max; | |
1165 | ||
1166 | /* there's nothing to read */ | |
63b74cda | 1167 | rsp.ret = -ENODATA; |
191d43cc | 1168 | if (log->read && (buf->r_off == buf->w_off)) |
63b74cda CB |
1169 | goto out; |
1170 | ||
63b74cda | 1171 | rsp.ret = 0; |
23e0d9af | 1172 | if (log->clear) |
43366ca2 | 1173 | lxc_ringbuf_clear(buf); /* clear the ringbuffer */ |
23e0d9af | 1174 | else if (rsp.datalen > 0) |
191d43cc CB |
1175 | lxc_ringbuf_move_read_addr(buf, rsp.datalen); |
1176 | ||
1177 | out: | |
1178 | return lxc_cmd_rsp_send(fd, &rsp); | |
1179 | } | |
1180 | ||
974a8aba CB |
1181 | int lxc_cmd_serve_state_clients(const char *name, const char *lxcpath, |
1182 | lxc_state_t state) | |
1183 | { | |
1184 | int stopped; | |
1185 | ssize_t ret; | |
1186 | struct lxc_cmd_rr cmd = { | |
6c6497ea CB |
1187 | .req = { |
1188 | .cmd = LXC_CMD_SERVE_STATE_CLIENTS, | |
1189 | .data = INT_TO_PTR(state) | |
1190 | }, | |
974a8aba CB |
1191 | }; |
1192 | ||
1193 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
6c6497ea CB |
1194 | if (ret < 0) |
1195 | return log_error_errno(-1, errno, "Failed to serve state clients"); | |
974a8aba CB |
1196 | |
1197 | return 0; | |
1198 | } | |
1199 | ||
1200 | static int lxc_cmd_serve_state_clients_callback(int fd, struct lxc_cmd_req *req, | |
cdb2a47f CB |
1201 | struct lxc_handler *handler, |
1202 | struct lxc_epoll_descr *descr) | |
974a8aba CB |
1203 | { |
1204 | int ret; | |
1205 | lxc_state_t state = PTR_TO_INT(req->data); | |
1206 | struct lxc_cmd_rsp rsp = {0}; | |
1207 | ||
1208 | ret = lxc_serve_state_clients(handler->name, handler, state); | |
1209 | if (ret < 0) | |
ea2a070b | 1210 | return LXC_CMD_REAP_CLIENT_FD; |
974a8aba CB |
1211 | |
1212 | ret = lxc_cmd_rsp_send(fd, &rsp); | |
1213 | if (ret < 0) | |
ea2a070b | 1214 | return LXC_CMD_REAP_CLIENT_FD; |
974a8aba CB |
1215 | |
1216 | return 0; | |
974a8aba CB |
1217 | } |
1218 | ||
cdb2a47f CB |
1219 | int lxc_cmd_seccomp_notify_add_listener(const char *name, const char *lxcpath, |
1220 | int fd, | |
1221 | /* unused */ unsigned int command, | |
1222 | /* unused */ unsigned int flags) | |
1223 | { | |
1224 | ||
c3e3c21a | 1225 | #ifdef HAVE_SECCOMP_NOTIFY |
cdb2a47f CB |
1226 | int ret, stopped; |
1227 | struct lxc_cmd_rr cmd = { | |
1228 | .req = { | |
1229 | .cmd = LXC_CMD_SECCOMP_NOTIFY_ADD_LISTENER, | |
1230 | .data = INT_TO_PTR(fd), | |
1231 | }, | |
1232 | }; | |
1233 | ||
1234 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
6c6497ea CB |
1235 | if (ret < 0) |
1236 | return log_error_errno(-1, errno, "Failed to add seccomp listener"); | |
cdb2a47f CB |
1237 | |
1238 | return cmd.rsp.ret; | |
1239 | #else | |
3d0327ed | 1240 | return ret_set_errno(-1, ENOSYS); |
cdb2a47f CB |
1241 | #endif |
1242 | } | |
1243 | ||
1244 | static int lxc_cmd_seccomp_notify_add_listener_callback(int fd, | |
1245 | struct lxc_cmd_req *req, | |
1246 | struct lxc_handler *handler, | |
1247 | struct lxc_epoll_descr *descr) | |
1248 | { | |
1249 | struct lxc_cmd_rsp rsp = {0}; | |
cdb2a47f | 1250 | |
c3e3c21a CB |
1251 | #ifdef HAVE_SECCOMP_NOTIFY |
1252 | int ret; | |
f62cf1d4 | 1253 | __do_close int recv_fd = -EBADF; |
cdb2a47f | 1254 | |
c3e3c21a CB |
1255 | ret = lxc_abstract_unix_recv_fds(fd, &recv_fd, 1, NULL, 0); |
1256 | if (ret <= 0) { | |
1257 | rsp.ret = -errno; | |
1258 | goto out; | |
cdb2a47f CB |
1259 | } |
1260 | ||
c3e3c21a CB |
1261 | if (!handler->conf->seccomp.notifier.wants_supervision || |
1262 | handler->conf->seccomp.notifier.proxy_fd < 0) { | |
1263 | SYSERROR("No seccomp proxy fd specified"); | |
1264 | rsp.ret = -EINVAL; | |
1265 | goto out; | |
1266 | } | |
cdb2a47f | 1267 | |
c3e3c21a | 1268 | ret = lxc_mainloop_add_handler(descr, recv_fd, seccomp_notify_handler, |
cdb2a47f | 1269 | handler); |
c3e3c21a CB |
1270 | if (ret < 0) { |
1271 | rsp.ret = -errno; | |
1272 | goto out; | |
1273 | } | |
68a9e3eb | 1274 | move_fd(recv_fd); |
cdb2a47f | 1275 | |
c3e3c21a | 1276 | out: |
cdb2a47f CB |
1277 | #else |
1278 | rsp.ret = -ENOSYS; | |
cdb2a47f | 1279 | |
c3e3c21a CB |
1280 | #endif |
1281 | return lxc_cmd_rsp_send(fd, &rsp); | |
cdb2a47f CB |
1282 | } |
1283 | ||
018051e3 CB |
1284 | int lxc_cmd_freeze(const char *name, const char *lxcpath, int timeout) |
1285 | { | |
1286 | int ret, stopped; | |
1287 | struct lxc_cmd_rr cmd = { | |
1288 | .req = { | |
1289 | .cmd = LXC_CMD_FREEZE, | |
1290 | .data = INT_TO_PTR(timeout), | |
1291 | }, | |
1292 | }; | |
1293 | ||
1294 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
1295 | if (ret <= 0 || cmd.rsp.ret < 0) | |
3d0327ed | 1296 | return log_error_errno(-1, errno, "Failed to freeze container"); |
018051e3 CB |
1297 | |
1298 | return cmd.rsp.ret; | |
1299 | } | |
1300 | ||
1301 | static int lxc_cmd_freeze_callback(int fd, struct lxc_cmd_req *req, | |
1302 | struct lxc_handler *handler, | |
1303 | struct lxc_epoll_descr *descr) | |
1304 | { | |
1305 | int timeout = PTR_TO_INT(req->data); | |
1306 | struct lxc_cmd_rsp rsp = { | |
6c6497ea | 1307 | .ret = -ENOENT, |
018051e3 CB |
1308 | }; |
1309 | struct cgroup_ops *ops = handler->cgroup_ops; | |
1310 | ||
1973b62a | 1311 | if (pure_unified_layout(ops)) |
018051e3 CB |
1312 | rsp.ret = ops->freeze(ops, timeout); |
1313 | ||
1314 | return lxc_cmd_rsp_send(fd, &rsp); | |
1315 | } | |
1316 | ||
1317 | int lxc_cmd_unfreeze(const char *name, const char *lxcpath, int timeout) | |
1318 | { | |
1319 | int ret, stopped; | |
1320 | struct lxc_cmd_rr cmd = { | |
1321 | .req = { | |
1322 | .cmd = LXC_CMD_UNFREEZE, | |
1323 | .data = INT_TO_PTR(timeout), | |
1324 | }, | |
1325 | }; | |
1326 | ||
1327 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
1328 | if (ret <= 0 || cmd.rsp.ret < 0) | |
3d0327ed | 1329 | return log_error_errno(-1, errno, "Failed to unfreeze container"); |
018051e3 CB |
1330 | |
1331 | return cmd.rsp.ret; | |
1332 | } | |
1333 | ||
1334 | static int lxc_cmd_unfreeze_callback(int fd, struct lxc_cmd_req *req, | |
1335 | struct lxc_handler *handler, | |
1336 | struct lxc_epoll_descr *descr) | |
1337 | { | |
1338 | int timeout = PTR_TO_INT(req->data); | |
1339 | struct lxc_cmd_rsp rsp = { | |
6c6497ea | 1340 | .ret = -ENOENT, |
018051e3 CB |
1341 | }; |
1342 | struct cgroup_ops *ops = handler->cgroup_ops; | |
1343 | ||
1973b62a | 1344 | if (pure_unified_layout(ops)) |
018051e3 CB |
1345 | rsp.ret = ops->unfreeze(ops, timeout); |
1346 | ||
1347 | return lxc_cmd_rsp_send(fd, &rsp); | |
1348 | } | |
1349 | ||
bad788b0 CB |
1350 | int lxc_cmd_get_cgroup2_fd(const char *name, const char *lxcpath) |
1351 | { | |
1352 | int ret, stopped; | |
1353 | struct lxc_cmd_rr cmd = { | |
1354 | .req = { | |
1355 | .cmd = LXC_CMD_GET_CGROUP2_FD, | |
1356 | }, | |
1357 | }; | |
1358 | ||
1359 | ret = lxc_cmd(name, &cmd, &stopped, lxcpath, NULL); | |
23a917e5 CB |
1360 | if (ret < 0) |
1361 | return -1; | |
1362 | ||
1363 | if (cmd.rsp.ret < 0) | |
a5263e59 | 1364 | return log_debug_errno(cmd.rsp.ret, -cmd.rsp.ret, "Failed to receive cgroup2 fd"); |
bad788b0 CB |
1365 | |
1366 | return PTR_TO_INT(cmd.rsp.data); | |
1367 | } | |
1368 | ||
1369 | static int lxc_cmd_get_cgroup2_fd_callback(int fd, struct lxc_cmd_req *req, | |
1370 | struct lxc_handler *handler, | |
1371 | struct lxc_epoll_descr *descr) | |
1372 | { | |
1373 | struct lxc_cmd_rsp rsp = { | |
1374 | .ret = -EINVAL, | |
1375 | }; | |
1376 | struct cgroup_ops *ops = handler->cgroup_ops; | |
1377 | int ret; | |
1378 | ||
1973b62a | 1379 | if (!pure_unified_layout(ops) || !ops->unified) |
bad788b0 CB |
1380 | return lxc_cmd_rsp_send(fd, &rsp); |
1381 | ||
1382 | rsp.ret = 0; | |
1973b62a | 1383 | ret = lxc_abstract_unix_send_fds(fd, &ops->unified->cgfd_con, 1, &rsp, |
bad788b0 CB |
1384 | sizeof(rsp)); |
1385 | if (ret < 0) | |
a804c19b | 1386 | return log_error(LXC_CMD_REAP_CLIENT_FD, "Failed to send cgroup2 fd"); |
bad788b0 CB |
1387 | |
1388 | return 0; | |
1389 | } | |
1390 | ||
ef6e34ee | 1391 | static int lxc_cmd_process(int fd, struct lxc_cmd_req *req, |
cdb2a47f CB |
1392 | struct lxc_handler *handler, |
1393 | struct lxc_epoll_descr *descr) | |
724e753c | 1394 | { |
cdb2a47f CB |
1395 | typedef int (*callback)(int, struct lxc_cmd_req *, struct lxc_handler *, |
1396 | struct lxc_epoll_descr *); | |
ef6e34ee DE |
1397 | |
1398 | callback cb[LXC_CMD_MAX] = { | |
2a63b5cb CB |
1399 | [LXC_CMD_CONSOLE] = lxc_cmd_console_callback, |
1400 | [LXC_CMD_TERMINAL_WINCH] = lxc_cmd_terminal_winch_callback, | |
1401 | [LXC_CMD_STOP] = lxc_cmd_stop_callback, | |
1402 | [LXC_CMD_GET_STATE] = lxc_cmd_get_state_callback, | |
1403 | [LXC_CMD_GET_INIT_PID] = lxc_cmd_get_init_pid_callback, | |
1404 | [LXC_CMD_GET_CLONE_FLAGS] = lxc_cmd_get_clone_flags_callback, | |
1405 | [LXC_CMD_GET_CGROUP] = lxc_cmd_get_cgroup_callback, | |
1406 | [LXC_CMD_GET_CONFIG_ITEM] = lxc_cmd_get_config_item_callback, | |
1407 | [LXC_CMD_GET_NAME] = lxc_cmd_get_name_callback, | |
1408 | [LXC_CMD_GET_LXCPATH] = lxc_cmd_get_lxcpath_callback, | |
1409 | [LXC_CMD_ADD_STATE_CLIENT] = lxc_cmd_add_state_client_callback, | |
1410 | [LXC_CMD_CONSOLE_LOG] = lxc_cmd_console_log_callback, | |
1411 | [LXC_CMD_SERVE_STATE_CLIENTS] = lxc_cmd_serve_state_clients_callback, | |
1412 | [LXC_CMD_SECCOMP_NOTIFY_ADD_LISTENER] = lxc_cmd_seccomp_notify_add_listener_callback, | |
1413 | [LXC_CMD_ADD_BPF_DEVICE_CGROUP] = lxc_cmd_add_bpf_device_cgroup_callback, | |
018051e3 CB |
1414 | [LXC_CMD_FREEZE] = lxc_cmd_freeze_callback, |
1415 | [LXC_CMD_UNFREEZE] = lxc_cmd_unfreeze_callback, | |
bad788b0 | 1416 | [LXC_CMD_GET_CGROUP2_FD] = lxc_cmd_get_cgroup2_fd_callback, |
746aab51 | 1417 | [LXC_CMD_GET_INIT_PIDFD] = lxc_cmd_get_init_pidfd_callback, |
724e753c MN |
1418 | }; |
1419 | ||
23a917e5 CB |
1420 | if (req->cmd >= LXC_CMD_MAX) |
1421 | return log_error_errno(-1, ENOENT, "Undefined command id %d", req->cmd); | |
1422 | ||
cdb2a47f | 1423 | return cb[req->cmd](fd, req, handler, descr); |
724e753c MN |
1424 | } |
1425 | ||
ef6e34ee | 1426 | static void lxc_cmd_fd_cleanup(int fd, struct lxc_handler *handler, |
cdb2a47f | 1427 | struct lxc_epoll_descr *descr, const lxc_cmd_t cmd) |
724e753c | 1428 | { |
3dfe6f8d | 1429 | lxc_terminal_free(handler->conf, fd); |
724e753c | 1430 | lxc_mainloop_del_handler(descr, fd); |
f6fc1565 | 1431 | |
cd5369b0 | 1432 | if (cmd == LXC_CMD_ADD_STATE_CLIENT) { |
ab92468c CB |
1433 | struct lxc_list *cur, *next; |
1434 | ||
cdb2a47f CB |
1435 | lxc_list_for_each_safe(cur, &handler->conf->state_clients, next) { |
1436 | struct lxc_state_client *client = cur->elem; | |
1437 | ||
1438 | if (client->clientfd != fd) | |
1439 | continue; | |
1440 | ||
ab92468c CB |
1441 | /* |
1442 | * Only kick client from list so it can't be found | |
1443 | * anymore. The actual close happens, as for all other | |
1444 | * file descriptors, below. | |
1445 | */ | |
cdb2a47f | 1446 | lxc_list_del(cur); |
cdb2a47f CB |
1447 | free(cur->elem); |
1448 | free(cur); | |
ab92468c | 1449 | |
39e2a438 CB |
1450 | /* |
1451 | * No need to walk the whole list. If we found the state | |
cdb2a47f CB |
1452 | * client fd there can't be a second one. |
1453 | */ | |
ea2a070b | 1454 | TRACE("Found state client fd %d in state client list for command \"%s\"", fd, lxc_cmd_str(cmd)); |
ab92468c | 1455 | break; |
cdb2a47f | 1456 | } |
39e2a438 CB |
1457 | |
1458 | /* | |
1459 | * We didn't add the state client to the list. Either because | |
1460 | * we failed to allocate memory (unlikely) or because the state | |
1461 | * was already reached by the time we were ready to add it. So | |
1462 | * fallthrough and clean it up. | |
1463 | */ | |
ea2a070b | 1464 | TRACE("Closing state client fd %d for command \"%s\"", fd, lxc_cmd_str(cmd)); |
f6fc1565 | 1465 | } |
cd5369b0 | 1466 | |
ea2a070b | 1467 | TRACE("Closing client fd %d for command \"%s\"", fd, lxc_cmd_str(cmd)); |
cd5369b0 | 1468 | close(fd); |
724e753c MN |
1469 | } |
1470 | ||
84c92abd DE |
1471 | static int lxc_cmd_handler(int fd, uint32_t events, void *data, |
1472 | struct lxc_epoll_descr *descr) | |
724e753c | 1473 | { |
5265a60c | 1474 | __do_free void *reqdata = NULL; |
724e753c | 1475 | int ret; |
ef6e34ee | 1476 | struct lxc_cmd_req req; |
724e753c MN |
1477 | struct lxc_handler *handler = data; |
1478 | ||
aae93dd3 | 1479 | ret = lxc_abstract_unix_rcv_credential(fd, &req, sizeof(req)); |
ded1d23f | 1480 | if (ret < 0) { |
ea2a070b | 1481 | SYSERROR("Failed to receive data on command socket for command \"%s\"", lxc_cmd_str(req.cmd)); |
9044b79e | 1482 | |
1483 | if (errno == EACCES) { | |
1484 | /* We don't care for the peer, just send and close. */ | |
ea2a070b | 1485 | struct lxc_cmd_rsp rsp = { |
f7a97743 | 1486 | .ret = -EPERM, |
ea2a070b | 1487 | }; |
9044b79e | 1488 | |
1489 | lxc_cmd_rsp_send(fd, &rsp); | |
1490 | } | |
1491 | ||
724e753c MN |
1492 | goto out_close; |
1493 | } | |
1494 | ||
fe84a562 | 1495 | if (ret == 0) |
724e753c | 1496 | goto out_close; |
724e753c | 1497 | |
ef6e34ee | 1498 | if (ret != sizeof(req)) { |
ea2a070b | 1499 | WARN("Failed to receive full command request. Ignoring request for \"%s\"", lxc_cmd_str(req.cmd)); |
ef6e34ee DE |
1500 | goto out_close; |
1501 | } | |
1502 | ||
ea2a070b CB |
1503 | if ((req.datalen > LXC_CMD_DATA_MAX) && (req.cmd != LXC_CMD_CONSOLE_LOG)) { |
1504 | ERROR("Received command data length %d is too large for command \"%s\"", req.datalen, lxc_cmd_str(req.cmd)); | |
724e753c MN |
1505 | goto out_close; |
1506 | } | |
1507 | ||
ef6e34ee | 1508 | if (req.datalen > 0) { |
5265a60c | 1509 | reqdata = must_realloc(NULL, req.datalen); |
e3233f26 | 1510 | ret = lxc_recv_nointr(fd, reqdata, req.datalen, 0); |
ef6e34ee | 1511 | if (ret != req.datalen) { |
ea2a070b | 1512 | WARN("Failed to receive full command request. Ignoring request for \"%s\"", lxc_cmd_str(req.cmd)); |
ef6e34ee DE |
1513 | goto out_close; |
1514 | } | |
fe84a562 | 1515 | |
ef6e34ee DE |
1516 | req.data = reqdata; |
1517 | } | |
1518 | ||
cdb2a47f | 1519 | ret = lxc_cmd_process(fd, &req, handler, descr); |
724e753c | 1520 | if (ret) { |
fe84a562 | 1521 | /* This is not an error, but only a request to close fd. */ |
724e753c MN |
1522 | goto out_close; |
1523 | } | |
1524 | ||
1525 | out: | |
f7a97743 | 1526 | return LXC_MAINLOOP_CONTINUE; |
fe84a562 | 1527 | |
724e753c | 1528 | out_close: |
f6fc1565 | 1529 | lxc_cmd_fd_cleanup(fd, handler, descr, req.cmd); |
724e753c MN |
1530 | goto out; |
1531 | } | |
1532 | ||
84c92abd DE |
1533 | static int lxc_cmd_accept(int fd, uint32_t events, void *data, |
1534 | struct lxc_epoll_descr *descr) | |
724e753c | 1535 | { |
f62cf1d4 | 1536 | __do_close int connection = -EBADF; |
fe84a562 | 1537 | int opt = 1, ret = -1; |
724e753c MN |
1538 | |
1539 | connection = accept(fd, NULL, 0); | |
6c6497ea CB |
1540 | if (connection < 0) |
1541 | return log_error_errno(LXC_MAINLOOP_ERROR, errno, "Failed to accept connection to run command"); | |
724e753c | 1542 | |
fe84a562 | 1543 | ret = fcntl(connection, F_SETFD, FD_CLOEXEC); |
6c6497ea CB |
1544 | if (ret < 0) |
1545 | return log_error_errno(ret, errno, "Failed to set close-on-exec on incoming command connection"); | |
9ccb2dbc | 1546 | |
fe84a562 | 1547 | ret = setsockopt(connection, SOL_SOCKET, SO_PASSCRED, &opt, sizeof(opt)); |
6c6497ea CB |
1548 | if (ret < 0) |
1549 | return log_error_errno(ret, errno, "Failed to enable necessary credentials on command socket"); | |
724e753c | 1550 | |
ef6e34ee | 1551 | ret = lxc_mainloop_add_handler(descr, connection, lxc_cmd_handler, data); |
6c6497ea CB |
1552 | if (ret) |
1553 | return log_error(ret, "Failed to add command handler"); | |
724e753c | 1554 | |
ea2a070b | 1555 | TRACE("Accepted new client as fd %d on command server fd %d", connection, fd); |
240fecd0 | 1556 | move_fd(connection); |
724e753c | 1557 | return ret; |
724e753c MN |
1558 | } |
1559 | ||
9dfa4041 | 1560 | int lxc_cmd_init(const char *name, const char *lxcpath, const char *suffix) |
724e753c | 1561 | { |
f62cf1d4 | 1562 | __do_close int fd = -EBADF; |
c13e7111 | 1563 | int ret; |
b1234129 | 1564 | char path[LXC_AUDS_ADDR_LEN] = {0}; |
724e753c | 1565 | |
5b46db1a | 1566 | ret = lxc_make_abstract_socket_name(path, sizeof(path), name, lxcpath, NULL, suffix); |
fe84a562 | 1567 | if (ret < 0) |
9ba8130c | 1568 | return -1; |
724e753c | 1569 | |
aae93dd3 | 1570 | fd = lxc_abstract_unix_open(path, SOCK_STREAM, 0); |
724e753c | 1571 | if (fd < 0) { |
08aa08fe | 1572 | if (errno == EADDRINUSE) |
fe84a562 | 1573 | ERROR("Container \"%s\" appears to be already running", name); |
6d1400b5 | 1574 | |
6c6497ea | 1575 | return log_error_errno(-1, errno, "Failed to create command socket %s", &path[1]); |
724e753c MN |
1576 | } |
1577 | ||
fe84a562 | 1578 | ret = fcntl(fd, F_SETFD, FD_CLOEXEC); |
6c6497ea CB |
1579 | if (ret < 0) |
1580 | return log_error_errno(-1, errno, "Failed to set FD_CLOEXEC on command socket file descriptor"); | |
91480a0f | 1581 | |
6c6497ea | 1582 | return log_trace(move_fd(fd), "Created abstract unix socket \"%s\"", &path[1]); |
d2e30e99 DE |
1583 | } |
1584 | ||
fe84a562 | 1585 | int lxc_cmd_mainloop_add(const char *name, struct lxc_epoll_descr *descr, |
ef6e34ee | 1586 | struct lxc_handler *handler) |
d2e30e99 | 1587 | { |
fe84a562 | 1588 | int ret; |
d2e30e99 | 1589 | |
ea2a070b | 1590 | ret = lxc_mainloop_add_handler(descr, handler->conf->maincmd_fd, lxc_cmd_accept, handler); |
6c6497ea | 1591 | if (ret < 0) |
ea2a070b | 1592 | return log_error(ret, "Failed to add handler for command socket fd %d", handler->conf->maincmd_fd); |
724e753c MN |
1593 | |
1594 | return ret; | |
1595 | } |